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What is Ground Penetrating Radar (GPR)

Ground Penetrating Radar (GPR) is a geophysical survey technique often utilises in the civil engineering and geological industries. GPR allows for a pseudo cross-section of the subsurface to be created to that shows the locations and depths of features and layers therein.

Ground Penetrating Radar works by emitting electromagnetic waves into the subsurface. The signal reflects of changes in the electromagnetic properties of objects, layers and features within the subsurface. The greater the change in these properties the higher the reflection coefficient thus the greater the percentage of the signal that is reflected and recorded by the GPR system; and vice-versa.

The GPR system builds an image of the ground from these reflections of the waves assigning each reflection its own amplitude. These images can be interpreted by skilled surveys and techniques to determine the makeup of the subsurface.

Despite its name, GPR can be used on a wide range of surfaces and elements, including walls, slabs and soffits. Utilising different frequencies trained surveyors can resolve features as detailed as the number of plasterboard sheets to the thickness of bedrock.

To find out how GPR can help on your project please get in touch with GPR Pro.